What's the most cost-effective way to create email marketing content for a technical professional services firm's customers and prospects?

We're a small, technical, professional services firm. Over the years we've experimented with email marketing -- both to existing customers and prospects -- with decent results. However, as with all small business marketing efforts, since we don't have a staffer dedicated to marketing, after some weeks or months of giving it the Old College Try, the person in charge gets busy with other stuff (usually implementing technical projects or pursuing prospects, maybe as a result of the email marketing efforts), and the campaign goes dark until sales slow again. Our challenges to outsourcing content generation have been: 1. The author needs to understand the business audience and the technical subject matter 2. The owner of our firm is a former professional author and is thus extraordinarily picky about content aesthetics like voice, tone, syntax, etc. but he doesn't have time to micromanage every content posting (ok, ok, it's me) Do you have suggestions about where we can find a cost-effective author, and how to manage this person, and the campaigns, to minimize my involvement and visceral need to rewrite every piece?!? Thanks!